Rotary rasps, textile comb circles and similar articles



Dec. 13, 1966 M. BROWN 3,2903% ROTARY RAsPs TEXTiDE COMB CIRCLES AND SIMILAR ARTICLES Filed May 21, 1964 2 Sheets-Sheet 1 1 7%.: COL/7 .Bmawm r702: Y: 4% 4. W1;

Dec. 3 1966 M. BROWN 3,290,75

ROTARY RASPS, TEXTILE COMB CIRCLES AND SIMILAR ARTICLES Filed May 21, 1964 2 Sheets-Sheet z o o o. Marci/v BROWN.

0 00 4 aria Fair; o o 5-o 4W 4. ,Jt /lg United States Patent 3,290,755 ROTARY RASPS, TEXTILE COMB CIRCLES AND SIMILAR ARTICLES Malcolm Brown, 48 Southfield Road, Bradford, England Filed May 21, 1964, Ser. No. 369,170

' 3 Claims. (CI. 29-78) This invention relates to rotary rasps of the kind which are furnished with pins arranged to project in a radial direction from their peripheries.

The pins are usually set in a single foundation ring, circle or annular member by driving said pins into preformed bores formed in the rings. During use the pins either wear down or become damaged and have to be replaced. This necessitates the removal of the pins from the rings and their subsequent replacement by fresh sharp pins.

The rings or annular foundation members are somewhat heavy and bulky. Consequently, their transportation and handling problems may be quite expensive and inconvenient to effect when re-pinning is necessary.

The chief object of the present invention is to overcome the difiiculty of transportation and handling associated with conventional rotary rasps, by providing a new or improved construction thereof.

A rotary rasp according to the invention has a plurality of segmented arcuate members which interfit to form a complete circle interposed and secured between a pair of discs or side plates, said members having a multiplicity of pins projecting from their convex outer faces in a radial or a substantially radial direction.

In order that the invention may be fully and clearly comprehended the same will now be described with reference to the accompanying diagrammatic drawings, in which:

FIGURE 1 is a fragmented axial section of a rotary rasp according to one embodiment of the invention;

FIGURES 2 and 3 are similar views to FIGURE 1 of modifications of the invention;

FIGURE 4 is a side view of one of a pair of plates in combination with washers forming part of the rasp illustrated in FIGURE 1, drawn to smaller scale;

FIGURE 5 is a side view of a rasp according to FIG- URE 1, drawn to smaller scale and with one of the plates removed;

FIGURE 6 is an enlarged side view of one of a plurality of identical detachable segmented arcuate members according to the invention;

FIGURES 7 and 8 are similar views to FIGURE 6 of fragments of modified segmented members of rasps according to the invention;

FIGURE 9 is a front view of the coacting ends of two arcuate members according to another modification of the invention.

Two circular clamping plates 1 and 2 are each furnished with a central bore for accommodating a supporting and driving shaft or mandrel 3, and formed in the inner face of each plate is a concentric channel or groove 4 of predetermined width and depth, said groove being preferably in close proximity to the outer periphery of the plate.

Adapted to coact with the aforesaid plates 2 and 3 are a plurality of segmented arcuate members 5, each of a thickness or with ends of a thickness corresponding to the depth of the channels 4 of the plates and of similar radius. FIGURES 5 and 6 show that each member 5 is set with a multiplicity of pins 6 of predetermined length and cross-sectional shape whose sharpened ends or points 3,290,755 Patented Dec. 13, 1966 project in a radial direction from the outer convex face of the foundation members 5 for a suitable distance.

To assemble a rasp according to the invention a number of segmented members 5 sufiicient to completely fill or occupy the opposing channels 4 of a pair of plates 1 and 2 are interposed between the plates and are securely held in position in any suitable manner. For instance, nuts may be provided on the shaft 3 for clamping together the discs 1 and 2 and the interposed segmented members 5.

Preferably, the segmented members 5 are formed of a synthetic resin plastic material having the pins 6 molded integrally therewith, or with separately formed pins driven into pre-formed bores to set and secure them therein, but it must be understood that said members could be composed of metal, suitable alloy or of a combination of synthetic resin and metal as shown in FIGURE 3. If desired, the synthetic resin plastic material may be in the form of two or more molded plies which are adhered together and they may be of any desired cross-sectional shape. Suitable synthetic resins include epoxy type resins and their catalysts and polyamide resins, such as nylon 66. In the case of thermosetting plastics the latter may include all derivatives of Nylon 66, which is a nylon obtained by the condensation of hexamethylene diamine and adipic acid, polyvinyl-chloride in its various forms or any other type of synthetic plastic resin material having the pins moulded, driven or otherwise set or secured therein.

When the segmented members 5 are no longer useful because the pins 6 have become blunt and worn, they may be easily and quickly removed by dismantling the plates 1 and 2 from the mandrel 3 or by moving the plates apart. Thereafter, fresh segments or re-pinned segments may be fitted to the plates as already described.

It must be understood that the plates 1 and 2 may be of any suitable design and may include internal bosses 10 as shown in FIGURE 1. Also, washers 11 are provided, as shown in FIG. 4 side view, to serve as pieces which are interposed between the plates 1 and 2 in such manner that the outer periphery of the washers 11 engages with the concave inner faces of the arcuate segmented members 5. The washers 11 may be used in any of the modifications of the invention shown in the drawing.

Furthermore, the ends of the segmented member 5 may be shaped so as to interlock as shown in FIGURES 7 and 8 or they may be angularly or similarly formed to coact as shown in FIGURE 9.

Rotary rasps according to the invention are particularly useful when employed in connection with machines for stripping and removing the treads and/ or side walls from vehicle tires prior to re-treading or re-building operations.

I claim:

1. A rotary rasp comprising a pair of opposed mutually parallel clamping plates, each plate having an inner face and an outer face and a central aperture therein for engaging a shaft mounting, spacing boss means projecting from the inner face of one of said clamping plates which is located between said inner faces, said inner faces each being provided at mutually opposite positions with a peripheral groove, a plurality of arcuate, segmented, synthetic resin shoes having an inner peripheral face and an outer peripheral face and mutually parallel edges which are profiled to engage and to be compressed against the said peripheral grooves in the clamping plates, a plurality of closed grouped, radially directed, headless metal pins embedded in said shoes, each pin having a sharp end and a blunt end and being embedded in the shoes such that the sharp ends project from the outer surface of the shoes,

3 4 and reinforcement means including an annular member References Cited by the Examiner having an outer edge bearing against the inner surface of UNITED STATES PATENTS the shoes and an inner edge bearing agalnst said boss means, said reinforcing means lying between said clamp- 3,116,536 1/1964 Tobey ing plates and shaped to bear against the peripheral sur- 5 FOREIGN PATENTS faces of the shoes thereby supportlng the blunt end of the 516,463 2/1955 Italy.

pins. 1

2. A rotary rasp according to claim 1, wherein said WILLIAM W DYER JR Primary Examiner shoes are made of polyamide resin. l

3. A rotary rasp according to claim 1, wherein said 10 HARRISON HINSON, Exam!!!"- shoes are made of epoxy resin. 

1. A ROTARY RASP COMPRISING A PAIR OF OPPOSED MUTUALLY PARALLEL CLAMPING PLATES, EACH PLATE HAVING AN INNER FACE AND AN OUTER FACE AND A CENTRAL APERTURE THEREIN FOR ENGAGING A SHAFT MOUNTING, SPACING BOSS MEANS PROJECTING FROM THE INNER FACE OF ONE OF SAID CLAMPING PLATES WHICH IS LOCATED BETWEEN SAID INNER FACES, SAID INNER FACES EACH BEING PROVIDED AT MUTUALLY OPPOSITE POSITIONS WITH A PERIPHERAL GROOVE, A PLURALITY OF ARCUATE, SEGMENTED, SYNTHETIC RESIN SHOES HAVING AN INNER PERIPHERAL FACE AND AN OUTER PERIPHERAL FACE AND MUTUALLY PARALLEL EDGES WHICH ARE PROFILED TO ENGAGE AND TO BE COMPRESSED AGAINST THE SAID PERIPHERAL GROOVES IN THE CLAMPING PLATES, A PLURALITY OF CLOSED GROUPED, RADIALLY DIRECTED, HEADLESS METAL PINS EMBEDDED IN SAID SHOES, EACH PIN HAVING A SHARP END AND A BLUNT END AND BEING EMBEDDED IN THE SHOES SUCH THAT THE SHARP ENDS PROJECT FROM THE OUTER SURFACE OF THE SHOES, AND REINFORCEMENT MEANS INCLUDING AN ANNUALR MEMBER 